No gym membership, no problem: All you need is a simple park bench to get great arms, abs, and legs -- aka the perfect bikini body for summer -- fast

Step 1: Facing the bench, put your hands shoulder-width apart on the seat. Bend into a squat position. Step 2: Jump back with your feet only, keeping your hands on the bench, so you're in a plank position. Step 3: Jump back in towards the bench into your squat position, then stand up. Do 3 sets of 15.

Challenge yourself: Try to do this for one minute without stopping (it's harder than it sounds!).